Spring-calipees



W. W. SMITH.

Calipers.

Patented Oct. 1, 1850.

i UNTTED STATES PATENT QFFTCE.

WM. W. SMITH, OE BOSTON, MASSACHUSETTS.

SPRING-CALIPERS.

Specification of Letters Patent No. 7,689, dated October 1, 1850.

To all whom it may concern: WVhat I claim as my improvement and Be it known that I, XVILLIAM V. SMITH, wish to secure by Letters Patent is. 15

of Boston, in the county of Sufiolk and State The circular spring inclosed within the of Massachusetts, have invented a new and hollow head resting on the pivot on which 5 useful Improvement in the Spring Caliper the two parts turn and acting on the two and Divider, of which the following is a parts (or shanks) throwing them outward full and exact description, reference being against the nut on the cross bar. made to the inclosed drawing.

Letter A is the shank. 10 B is the cross bar and nut as usual in SMITH spring calipers and dividers. Witnesses: F C is the spring inclosed within the hollow JosHUA STEVENS,

head. E. V. B. HOLCOMB- 

